feat: Flat import of markdown repo

This is a flat (without history) import of (some of) the content
from our markdown module.

We've imported this without history because the repo contains our
blog posts and showcases posts content prior to porting them to strapi.

Since this contains many images, it would balloon the size of this repo
to import the full history.

Instead, please refer to the history of the (archived) markdown repo
at: https://github.com/freesewing/markdown

markdown/dev/reference/macros/scalebox/en.md

@@ -0,0 +1,27 @@
+---
+title: scalebox
+---
+
+The `scalebox` macro adds a *scale box* to your pattern. This box allows
+users to verify their pattern is printed to scale.
+
+The `scalebox` macro is provided by the [scalebox plugin](/reference/plugins/scalebox).
+
+<Example part="plugin_scalebox" caption="Example of the scalebox added by this macro" />
+
+```js
+macro('scalebox', {
+  at: points.anchor
+})
+```
+
+| Property    | Default | Type                | Description | 
+|-------------|---------|---------------------|-------------|
+| `at`        |         | [Point](/reference/api/point) | The point to anchor the *scale box* on |
+| `lead`      | FreeSewing | String           | The lead text above the title |
+| `title`     | *pattern name + version* | String | The title text |
+| `text`      | (\*)    | String              | The text below the title |
+| `rotate`    | 0       | Number              | Rotation in degrees |
+
+(\*) `freesewingIsMadeByJoostDeCockAndContributors \n withTheFinancialSupportOfOurPatrons`
+